The age of the experimental rats was a substantial contributor to the increased muscle mass in the plantaris muscles from both legs. The muscles grew since they were still so young.
Part of the poster superficial compartment of the calf, the plantaris is a tiny muscle that runs along the back of the leg. The plantaris muscle, which is frequently seen as an accessory, vestigial muscle, is absent from only 7–20% of limbs.
The plantaris functions to plantar flex the knee joint and ankle joint sporadically. The central nervous system may receive proprioceptive feedback information about the location of the foot from the plantaris muscle.
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